Xen is an open-source virtual machine monitor (VMM) for x86-compatible processors. It supports multiple operating systems including Windows, Linux, FreeBSD, Solaris and NetBSD. Xen is included in the mainline Linux kernel since 2.6.23 and FreeBSD since 8.0 .
Xen provides two different types of virtualization: paravirtualization and hardware virtualization
In this article we will see how to install Xen Virtual Machine on Ubuntu 13.10 Saucy Salamander with 3.11 Kernel
What is Xen?
Xen is a type-1 hypervisor, meaning that it runs directly on the system hardware. This provides a number of benefits over type-2 hypervisors, such as VMware Workstation or VirtualBox, which run on top of an operating system.
The most important benefit is that Xen has direct access to hardware resources, meaning that it can provide near-native performance for virtual machines (VMs).
Another important benefit of Xen is security. Because the hypervisor has direct access to hardware resources, it can better isolate VMs from each other.
This isolation makes it more difficult for an attacker to gain access to another VM on the same system.
Xen is also open source software, which means that it is free to download and use. This makes it a good choice for anyone looking to set up a virtualization environment on a budget.
Why Use Xen?
There are a number of reasons you might want to use Xen virtualization on Ubuntu, including:
- Xen is a stable, feature-rich virtualization solution that has been in development for many years.
- Xen is supported by a large community of developers and users, and there is a wealth of documentation available online.
- Xen provides excellent performance and scalability, and can be used to run a wide variety of operating systems and applications.
How to Install Xen on Ubuntu
Xen is an open source Virtual Machine (VM) system that allows you to run multiple virtual machines on a single physical computer.
Each virtual machine is isolated from the others, so you can run different operating systems on each one.
Xen is popular in the server world because it’s efficient and flexible. You can use it to run multiple servers on a single physical machine, which can save you money on hardware costs.
Installing Xen on Ubuntu is a straightforward process. The first thing you need to do is install the Xen hypervisor.
This is the software that will allow you to create and run virtual machines on your computer. To do this, open a terminal and type:
sudo apt-get install xen-hypervisor-4.6
This will install the Xen hypervisor on your computer. Once it’s installed, you need to edit your grub configuration so that Xen will be used as the default bootloader. To do this, type:
sudo nano /etc/default/grub
Find the line that says GRUB_DEFAULT=0 and change it to GRUB_DEFAULT=”xen”. This will tell Ubuntu to use Xen as the default bootloader.
Next, find the line that says #GRUB_HIDDEN_TIMEOUT=0 and remove the “#” from in front of it. This will tell Ubuntu to display the bootloader menu when the computer starts up.
Finally, find the line that says #GRUB_HIDDEN_TIMEOUT_QUIET=true and remove the “#” from in front of it so that it saysGRUB_HIDDEN_TIMEOUT_QUIET=false .
This will ensure that you see any error messages that are displayed during bootup.
Once you’ve made these changes, save the file by pressing CTRL+O , then exit by pressing CTRL+X . Now we need to update our grub configuration so that these changes take effect. To do this, type:
Once this completes, reboot your computer.
Creating a Xen Virtual Machine
In this guide, we will be creating a Xen virtual machine on an Ubuntu server. This guide assumes that you have already installed Xen and have a working knowledge of the Xen hypervisor.
Creating a Xen virtual machine is a two-step process. First, we will create a Xen configuration file that contains information about our virtual machine. Second, we will use the Xen configuration file to create the actual virtual machine.
Booting a Xen Virtual Machine
If you have not yet installed Xen on Ubuntu, please see the Xen installation page.
This section will guide you through booting a Xen virtual machine. For this post we will assume that you have prepared a root filesystem and kernel for your virtual machine which resides in /boot/xen/vmlinuz-2.6.18-4-xenU and /boot/xen/initrd.img-2.6.18-4-xenU respectively, that your network interface is called ‘eth0’ and has been given the IP address 192.168.0.100 with netmask 255.255.255.0, and that the machine you are installing this on is itself a Xen guest with the name ‘domU’.
To boot the newly created virtual machine, use the following command:
xm create -c /boot/xen/vmlinuz-2.6.18-4-xenU domU
Managing Xen Virtual Machines
Xen is a powerful platform for virtualization, and Ubuntu offers superb integration with it. With a little bit of effort, you can easily install Xen on Ubuntu, and this guide will show you how.
First, we need to add the universe repository to our sources:
sudo add-apt-repository universe
Then, update your package list:
sudo apt-get update
And finally, install the Xen hypervisor and related tools:
sudo apt-get install xen-hypervisor xen-tools
An older version of Xen is available in the multiverse repository. If you want to try it out, simply replace universe with multiverse in the commands above.
With Xen installed, we can now create virtual machines. For this guide, we will use the command line tool xl (Xen Light). This tool is included in the xen-tools package we installed earlier.
To create a new virtual machine, we simply run: sudo xl create /path/to/config.file The config file contains all the settings for our new VM.
A sample config file can be found in /etc/xen/xmexample.conf. Be sure to edit it to suit your needs before creating your VM!
Once your VM has been created, you can start it with: sudo xl start vmname And stop it with:
sudo xl shutdown vmname
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